In the multi-stage turbines range, Belliss offers back pressure turbines (up to 15 MW), straight condensing turbines (up to 20 MW) and extraction cum condensing turbines (up to 15 MW). Belliss has over 1200 multistage installations around the world. Belliss also offers very low pressure turbine which can be used for deriving power from the exhaust steam of up to 1.5kg/cm2 for additional power output and increasing the overall efficiency of the plant.

Back Pressure Turbines: These are turbines in which the exhaust pressure is above atmospheric pressure. Back Pressure Turbines are most widely used for process Steam applications. These are commonly found at refineries, district heating units, pulp, paper plants and sugar plants.

Condensing Turbines: Inside a condensing turbine, the steam expands below the atmospheric pressure and then "condenses while heating the cooling water in the condenser. In a Straight Condensing Turbine, the total steam that enters the turbine goes to the condensor and no steam is taken out from any stage in between the turbine.

Extraction Condensing Turbines: In an Extraction type turbine, steam is released from in between the stages of the turbine depending upon the industrial process needs. There are two types of Extraction Turbines;

a). UnControlled Extraction or Bleed Turbine: In this type of turbine, the extraction pressure depends on the flow to the exhaust of the turbine. When the extraction pressure is above the process pressure, the pressure control valve can maintain the required process pressure but if it falls, then the process pressure cannot be maintained.

b). Controlled Extraction or Pass Out Turbine: In this type of turbine, process pressure is controlled by means of a Control Valve called the Pass through Valve fitted inside the casing (between the HP and LP Casings). The Pass Through Valve is controlled by the turbine Governor to maintain the extraction pressure, upstream of the Pass Through Valve -  constant.

Turbine                   Power Rating                 Stages          Type

BD2                         4,023HP/3,000KW           07                  Back Pressure

SBP350                   4,023HP/3,000KW           04                  Back Pressure

MS26                       3,000HP/2,200KW           03                  Back Pressure

SBP450/450X          10,730HP/8,000KW         05/06             Back Pressure

SBP560/560X          17,500HP/13,000KW       05/06             Back Pressure

HEN-22/24               5,370HP/4,000KW          07                   Condensing

HEN-22/630             8,050HP/6,000KW          08                   Condensing

HES-14/37A/37M     8,050HP/6,000KW           07/07/06        Back Presure

(HES-37M is designed for high inlet parameters of 64kg/cm2g and 490degC)

LPHSC630/800S      5,800HP/4,300KW           03                   Low Pr Condensing